Schedule I - Condensed Statements of Cash Flow (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 24, 2016	Mar. 25, 2016	Dec. 31, 2015	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income									$ 0	$ 0	$ 0
Adjustments to reconcile net income to net cash provided by operating activities:
Income before allocations to partners	$ 161	$ 186	$ 208	$ 191	$ 194	$ 208	$ 222	$ 214	746	838	770
Changes in assets and liabilities:
Other assets									0		(33)
Accounts payable and accrued expenses									(20)	19	20
Net cash provided by operating activities									905	444	1,206
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of partnership interests									72	352	55
Redemption of partnership interests									(178)	(161)	(125)
Distributions from partnership capital									(616)	(637)	(563)
Net cash used in financing activities									(722)	(446)	(683)
Net increase (decrease) in cash and cash equivalents									110	(96)	433
CASH AND CASH EQUIVALENTS:
Beginning of year				937				1,033	937	1,033	600
End of year	1,047				937				1,047	937	1,033
NON-CASH ACTIVITIES:
Issuance of general partnership interests through partnership loans in current year									146	119	86
Repayment of partnership loans through distributions from partnership capital in current year									98	99	103
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income									0	0	0
Adjustments to reconcile net income to net cash provided by operating activities:
Income before allocations to partners									746	838	770
Changes in assets and liabilities:
Investment in subsidiaries									105	(179)	(267)
Other assets									(4)	0	(3)
Accounts payable and accrued expenses									0	(1)	0
Net cash provided by operating activities									847	658	500
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of partnership interests									72	352	55
Redemption of partnership interests									(178)	(161)	(125)
Distributions from partnership capital									(616)	(637)	(563)
Net cash used in financing activities									(722)	(446)	(633)
Net increase (decrease) in cash and cash equivalents									125	212	(133)
CASH AND CASH EQUIVALENTS:
Beginning of year				$ 331				$ 119	331	119	252
End of year	$ 456				$ 331				456	331	119
NON-CASH ACTIVITIES:
Issuance of general partnership interests through partnership loans in current year									146	119	86
Repayment of partnership loans through distributions from partnership capital in current year									$ 98	$ 99	$ 103